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CORfRIGHT DEPOSIT. 



STRUCTURAL DRAWING 

BY 

C. FRANKLIN EDMINSTER 
Instructor in Department of Fine and Applied Arts, 

PRATT institute, BROOKLYN, NEW YORK. 



FIRST EDITION, 

PUBLISHED BY THE AUTHOR. 



[UBHURV of congress] 
Two OoulBS «i«slved 
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Copyright, 1907, by C. FRANKLIN EDMINSTER. 



PREFACE. 



In preparing this work, the author has aimed 
to present to the mechanic and others who are 
interested, a systematic course of instruction in 
structural drawing, beginning with the standard 
forms and leading to the typical columns, girders, 
trusses, and framing details. 

The drawings are made as simple as possible, 
and many isometric views are given to further as- 
sist in reading and understanding the subject. 



A few problems in geometry and projection 
have been introduced for the benefit of those who 
have not studied drawing: also a short chapter 
covering the general notes on drawing materials. 

The student should begin with the first plate 
and follow in the order given, mastering each prob- 
lem in succession. 

C. Franklin Edminster 



CONTENTS. 



CHAPTER PAGE 

I. Notes on Materials . - - - -j 
II. Geometrical Problems - - - - 13 
III. Simple Projection, Introducing the Prin- 
ciples of Working Drawings - - 24 



CHAPTER 

IV. Structural Details - 
V. Steel Mill Construction 
VI. Iron Staircase Construction 



PAGE 

38 
108 
132 



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STRUCTURAL DRAWING. 



CHAPTER 1. 

NOTES ON MATERIALS. 



The student beginning tlie study of struc- 
tural drawing should provide himself with the 
necessary instruments of a good quality. He 
should not be hampered by using inferior ma- 
terials, as many difficulties will arise under even 
the best conditions. 

Drawing Boards. — One of the best methods 
of making a drawing board is to glue together 
narrow strips of boards, fastening two cleats 
(about two inches wide) across the back in 
such a way that there will be perfect freedom 
for the wood to expand and contract, which it 
surely will do as the humidity of the atmos- 
phere changes. This freedom may be obtained 



by cutting slots in the cleats through which the 
screws pass and placing iron washers under the 
heads of the screws. A much cheaper board 
can be constructed by securing narrow pieces 
across each end, which serve to hold the board 
from warping. This form of board will answer 
very well, especially if the paper used is not 
stretched. It is extremely important that one 
end and one side of the board should be per- 
fectly straight. 

Drawing Paper. — Drawing paper that is to 
be used for general draughting and line work 
in pencil or ink should have a firm, smooth 
surface that is not easily roughened when era- 



STRUCTURAL DRAWING. 



sures are made. As a rule, paper that is well 
adapted to line work will not receive a flat 
wash readily. Paper suitable for wash drawings 
is made with a surface less firm but rougher 
than for line work. Whatman's cold pressed 
paper possesses unusual properties, in that it 
works well for both line and wash drawings. 
For general detail work, some of the tinted 
papers are more pleasant to work upon than 
white, as the white is rather trying to the eyes, 
especially when used in the evening. For highly 
finished drawings, however, white paper is gen- 
erally preferred. The right side of the paper 
can usually be determined by holding it to the 
light and finding the water-mark, which should 
read correctly on the side used. Drawing paper 
may be obtained in sheets of standard sizes as 
follows: Cap, i3"xi7"; Demy, i5"x 20"; 
Medium, i'j"x 22"; Royal, i9"x24"; Super 
Royal, 19" X 27"; Imperial, 22"x3o"; Ele- 
phant, 23" X 28" ; Atlas, 26" x 34" ; Double 
Elephant, 27"x4o"; Antiquarian, 3i"x53"; 



Emperor, 48" x 68". The above terms apply 
only to the sizes of the sheets, and not in any 
way to grade or quality of the paper. 

T-Square, — The T-square is made of two 
parts, the head and blade, which are fastened 
together at right angles to each other. This 
instrument should be used for drawing horizon- 
tal lines only, always holding the head against 
the left-hand edge of the board. Should the 
draughtsman allow himself to use either left or 
right side of the board at will, the results ob- 
tained would be very inaccurate, owing to the 
fact that two ends or sides of the board are sel- 
dom, if ever, parallel. Again, many times the 
T-square blade does not form right angles with 
■ the head. One may readily see that horizontal 
lines drawn under such conditions would not 
be parallel. 

Triangles, — The draughtsman should provide 
himself with two triangles ; the 45°, and the 
30° and 60°. The triangles are used for draw- 
ing all lines that are not horizontal. Vertical 



STRUCTURAL DRAWING. 



lines should always be drawn by placing the tri- 
angle on the upper edge of the T-square blade, 
holding the pencil or pen in a plane perpendic- 
ular to the surface of the paper, inclining it 
slightly, and drawing upward, but never down- 
ward. In drawing horizontal lines, the pencil 
or pen should be held in a plane perpendicular 
to the paper, inclining it slightly to the right. 
Draw from left to right. Angles of 45°, 30°, 
60° and 90°, with a horizontal line, can be drawn 
at once by placing the triangle on the T-square 
blade. 

Instruments. — Instruments should be selected 
with the greatest care. It is much better to 
have a few pieces of excellent quality than a 
great number of inferior make. Choose qual- 
ity rather than quantity. Instruments should 
be well cared for, properly wiped each time 
after using, and the points prevented from con- 
tact with hard substances which will tend to in- 
jure them. 

Compasses, — When drawing with the com- 



passes the head should be held lightly between 
the thumb and two fingers, moving the leg con- 
taining the lead in the direction traversed by the 
hands of a clock, inclining it slightly in the 
direction of the line to be drawn. The joints 
in the legs should be so adjusted as to keep the 
lower sections perpendicular to the surface of 
the paper, and when a circle is of such a size as 
will not admit of this the lengthening bar should 
be inserted. 

Ruling Pen: — The ruling pen is a very impor- 
tant instrument and should be made of the very 
best hardened steel ; if not, it will give the stu- 
dent endless trouble. Most of the prepared 
inks in general use are provided with a quill in 
the cork of the bottle which lifts a certain 
amount of ink. The quill may be inserted be- 
tween the nibs of the pen and the ink allowed 
to flow into the pen. The ink should not be 
more than one-fourth of an inch deep between 
the nibs. Clean the pen frequently by immers- 
ing it first in clear water and then passing a 



10 



STRUCTURAL DRAWING. 



piece of cloth or chamois skin between the nibs. 
The pen should never be put away after using 
without being thoroughly cleansed. 

Pencil.— The character of the work performed 
by a student is generally influenced by the 
condition in which he keeps his pencil. It is 
impossible to do accurate work with a dull pen- 
cil. For all rule work the wedge-shaped point 
possesses an advantage over the round point, 
in that it has a greater wearing surface, hence 
will not require sharpening so often. For 
all freehand work nothing but the round or con- 
ical point should be used. Some draughtsmen 
prefer this point for rule work as well. The 
wood should be cut well back, leaving at least 
one-fourth of an inch of the lead exposed. One 
of the best sharpeners for a pencil is a fine flat 
file, on which the lead should be frequently 
applied, to produce a sharp point. Where 
great accuracy is required, the beginiier should 
use a 4 H pencil. As skill in draughting is 
acquired, a softer grade may be substituted. A 



medium grade pencil should be used for lin- 
inar-in the drawings where strength of line is 

o o o 

required. 

The Scale, — A scale is an instrument used in 
reducing a drawing that would otherwise be too 
large for the sheet of paper on which it is to be 
placed. For instance, if we have a building 
measuring 40 x 60 ft., the drawing may be made 
on a scale of % of an inch to i ft. The space 
occupied upon the plate would be 10 x 15 in., 
exactly in proportion to the actual size. In 
using this scale, or proportion, we have taken 
an actual Vi of an inch and considered it i ft. ; 
and this being taken as i ft. we divide it into 
12 parts, each part being equal to i in. There 
will be found several different scales upon the 
instrument, all of which are divided in a similar 
manner. 

Irregular Curve, — This instrument is used in 
drawing curves that cannot be accomplished by 
the use of the compass. Such curved lines usu- 
ally pass through a succession of points which 



STRUCTURAL DRAWING. 



II 



have already been found. The edge of the ir- 
regular curve should be so placed (by repeated 
trials) as to pass through as many points as pos- 
sible and also a portion of the line already drawn. 
Never draw through the last point covered by 
the irregular curve. This operation requires a 
great deal of care in order to produce a per- 
fectly smooth curve. 

Penciling. — Too much stress cannot be placed 
upon the first penciling of a drawing. All draw- 
ings, whether to be inked-in or left in a strong 
pencil line, should first be worked out with a 
light line and very accurately placed. Many 
students have the feeling that they can correct 
the little errors while lininsf-in the drawing: ; 
this is not so, the chances being that they will 
greatly increase rather than diminish the faults. 

Inking, — For highly finished drawings the 
stick India ink is generally preferred, but for 
ordinary work the prepared will be found satis- 
factory. The great advantage that stick ink 
possesses over the prepared is, that in case of 



error the line can readily be removed with the 
ordinary eraser. The disadvantage in using 
the stick ink is that considerable time each day 
is required to grind a fresh suppl}^. In inking 
a drawing the student should ink all circles and 
arcs of circles first, then, beginning with the 
upper horizontal line, ink in order those below. 
With the vertical lines, begin on the left side 
of the plate and ink each line in succession. 
When several lines meet at a point always begin 
to ink from that point, allowing each successive 
line to dry before drawing another, thus pre- 
venting a blot that would otherwise occur at 
their junction. 

Visible Lines, — The visible lines of an object 
are represented by a full black line. 

Invisible Lines, — Invisible lines or lines that 
are hidden are represented by a dash line, the 
dashes being about one-quarter of an inch long, 
the spaces between them being less than one- 
eighth of an inch. This line should be of the 
same strength as a visible line. 



STRUCTURAL DRAWING. 



Working Lines, — Working lines are used to 
obtain certain results, and if left in pencil should 
be very light, or if shown in ink, should be very 
light red or short dash black lines. 

Arrow Heads. — Arrow heads should always 
be in black and made with great care, their points 
just touching the line to be measured. 

Dimensioning. — In placing the dimensions it 
is always well to group as far as possible and not 
scatter them over the entire drawing. As a rule 
the same measurement should not appear in 
more than one view. The measurement line 
upon which the dimension is placed should not 
be drawn too near the line measured, usually 



about one-quarter of an inch away. It is cus- 
tomary to place all dimensions over twelve inches, 
as feet and inches, thus: 5'-6" (five feet and six 
inches), or if in even feet, thus: 3'-o"(three feet 
and no inches). When the space between two 
lines is not sufficient to place the measurements 
in the usual manner they may be placed thus : 

Horizontal measurements should 
(5 ^^ read from left to right, and vertical 

measurements should read up- 



"Tloo 



ward. Great care should be taken in making 
figures, as the worth and appearance of the draw- 
ing depend greatly upon them. 



CHAPTER II. 

GEOMETRICAL PROBLEMS. 



Prob. I. — To bisect a given straight line A B. 
From points A and B as centers and with 
any radius greater than half of the line A B, 
describe arcs above and below, intersecting in 
points I and 2. Draw a straight line through 
points I and 2, cutting the line A B at 3, thus 
bisecting the given line A B. 

Prob. 2. — To bisect an arc of a circle A B. 
From a point A as center and with any ra- 
dius greater than half of curve A B, draw arcs 
above and below. With B as center and the 
same radius, cut the arcs already drawn in points 
I and 2. Draw a straight line through points 



I and 2, intersecting the curve A B in 3, which 
will bisect the given arc A B. 

Prob. 3. — To bisect a given angle A B G 
With B as center and any radius, draw an 
arc cutting the lines B A and B C in points i 
and 2. With points i and 2 as centers and any 
radius greater than half of arc i - 2, describe 
arcs intersecting in point 3. Draw a line 
through points B and 3 which will bisect the 
given angle ABC. 

Prob. 4. — To trisect a given right angle ABC 
With B as center and any radius, draw an 
arc cutting the sides of the right angle in points 



14 



STRUCTURAL DRAWING. 



I and 2. With points i and 2 as centers and 

the same radius, draw arcs cutting in 3 and 4. 

Draw lines B 4 and B 3 which trisect the given 

right angle ABC. 

Pfob. 5.— To divide a given straight line A B into 6 
equal parts (applicable foi- any number). 

Draw the line A C at any angle to A B ; lay 

off on this line 6 divisions, each equal to about 

•^ of A B. Connect points 6 and B by a straight 

line. From points i, 2, 3, 4 and 5, draw lines 

parallel with 6 B cutting A B in a, b, c, d and e. 

Prob. 6. — To divide line A B into the same proportional 
parts as the given line C D. 
From point A draw a line at any angle to A 

B. Lay off on this line the points correspond- 
ing to points on line C D. Connect points 4 
and B. From points i, 2 and 3, draw lines 
parallel with 4 B, cutting the line A B in a, b 
and c. 

Prob. 7. — To divide a circle having the center given, 
into 6 equal parts. 
Draw the diameter 1-5. With points i and 5 

as centers and radius 1-2 describe arcs cuttinsf 



the circle in points 3, 4, 6 and 7, which, with 
points I and 5, are the desired divisions. 

Prob. 8. — From point A above the given line B C, 
draw a perpendicular to B C. 

With point A as center and any radius, cut B 
C in I and 2. With i and 2 as centers and any 
radius, draw arcs below. From A draw a straight 
line to point 3, which is the desired perpen- 
dicular. 

Prob. 9. — On a given line A B to erect a perpendic- 
ular at point A. 

With point A as center and any radius, draw 
an arc cutting A B in i. With i as center 
and the same radius, lay off points 2 and 3. 
With points 2 and 3 as centers and any radius, 
describe arcs above, cutting in 4. Connect 
points 4 and A, thus erecting the desired per- 
pendicular. 

Prob. JO. — To draw a line C D parallel to a given line 
A B at a given distance, as E F above it. 

Erect perpendiculars at points i and 2 by 

Prob. 9, lay off on these the distance E F, giv- 























Plate 1. 




PROB.I. 








PROS. 2.. 




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PROB. 5. 




PROB. G. 




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PROB. 7 








PROB. 8. 




PROB. 9. 




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STRUCTURAL DRAWING. 



ing points 3 and 4. Draw line C D through 3 

and 4. 

Prob. a. — Through point C draw the line D E paral- 
lel to A B. 

With point C as center and any radius, de- 
scribe an arc cutting A B in i. With i as cen- 
ter and same radius, describe an arc which will 
cut line A B in 2. With i as center and radius 
C 2, describe an arc cutting 1-3 in 3. Draw a 
straight line through points 3 and C, which will 
be the required line D E. 

Prob. 12. — To construct an angle equal to a given 
angle BAG. 

Draw the line D F. With A as center and 
any radius, describe an arc cutting the sides of 
the angle in points i and 2. With D as center 
and the same radius, describe an arc cutting D 
F in 3. With radius 1-2, and 3 as center, de- 
scribe an arc cutting 3-4 in 4. Draw D E 
through D 4. E D F is the angle required. 

Prob. J3. — Through point F draw a straight line which 

would meet the intersection of A B and C D 

if continued. 

Draw F i and F 2 at any angle. Connect 



1-2. From point 3 anywhere on A B make 3-4 
parallel with 1-2, 3 E parallel with i F, and 4 E 
parallel with 2 F, Pass a straight line through 
points F and E, which will be the desired line. 

Prob. t4. — Find the mean proportion between the 
two lines A B and C D. 

Lay off on E F, 1-2 equal to A B and 2-3 

equal to C D. Bisect 1-3 in 4. With 4 as center 

and radius 4-1, describe a semicircle. From 2 

erect a perpendicular (Prob. 9) to E F, cutting 

semicircle in 5. 2-5 will be the desired mean. 

Prob. J 5. — On the given line A Bto construct a square. 
Draw B i perpendicular to A B (Prob. 9) 

and equal to A B. With points A and i as 
centers and A B as radius, describe arcs cutting 
in 2. Draw A-2 and 2-1. 

Prob. J 6. — On a given line A B to construct an 
equilateral triangle. 

With A and B as centers, and A B as radius, 
describe arcs cutting in i. Draw A i and B i. 

Prob. J 7. — Having given the three sides of a triangle, 
as A B, C D and E F, to construct the figure. 

With point B as center and the radius C D, 



Plate 2. 



PROB 10. 



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PROB. II. 






fHOB. 12.. 




PROB. 15. 




PROB. 14. 



PROB. IS. 



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PROB. 17. 





i8 



STRUCTURAL DRAWING. 



describe an arc. With point A as center and 
E F as radius, describe an arc cutting the first 
in I. Draw A i and B i. 

Prob. 18. — On a given base A B to construct a regular 
hexagon. 

With A and B as centers and A B as radius, 

describe arcs cutting in i. With i as center 

and the same radius, describe a circle. A B is 

equal to | of its circumference. Step off 

points 2, 3, 4 and 5, and draw B-2, 2-3, 3-4, 4-5 

and 5-A. 

Prob. J9. — Within a given square A B C D to inscribe 
an octagon. 

Draw the diagonals A C and B D, intersect- 
ing in. I. With A, B, C and D as centers and 
radius A i, describe arcs 2-3, 4-5, 6-7 and 8-9: 
draw 3-6, 5-8, 7-2 and 9-4. 

Prob. 20. — On a given line A B to construct a 
pentagon. 

With A and B as centers and radius A B, 

describe arcs cutting in i and 2. Connect i 

and 2. With i as center and the same radius, 



describe an arc cutting at 3, 4 and 5. Pass a 
line through 3-4 to 6, and one through 5-4 to 7. 
With 7 and 6 as centers and radius A B, describe 
arcs intersecting in 8. Draw A 7, 7-8, 8-6 and 
6B. 

Prob. 21. — On a given base A B to construct an 
octagon. 

Erect perpendiculars at A and B. Bisect the 
exterior angles and set off A i and B 2 equal 
to A B. Connect 1-2, cutting the perpendicu- 
lars in 3 and 4. Make 3-5 and 4-6 equal to 3-4. 
Extend line through 5-6 indefinitely. Make 5-7, 
6-8, 5-9 and 6-10 equal to 3 A. Draw A i, 1-7, 
7-9, 9-10, 10-8, 8-2 and 2 B. 

Prob. 22. — Within a given equilateral triangle ABC 
to inscribe a circle- 

Bisect the angles of the triangle by Prob. 3. 
The bisectors will intersect in i . The perpen- 
dicular distance from i to any side of the tri- 
angle will be the radius of the desired circle. 
Note, this problem is true in any form of tri- 
angle. 



Plate 3. 




PROB, 13. 

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PROB. S.Z. 




PROB. 25. 








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PROB. 23 




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PROB. 24. 




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STRUCTURAL DRAWING. 



Prob. 23. — Within a square A B C D to inscribe foar 

semicircles, each touching one side of the square 

and their diameters forming a square. 

Draw diagonals A C and D B, intersecting 

in I. Draw diameters passing through I. Draw 

2-3, 3-4, 4-5 and 5-2. Draw 6-7, 7-8, 8-9 and 

9-6, which give us points 11, 12, 13 and 14, the 

centers of the required semicircles. 

Prob. 24. — Within a given equilateral triangle ABC 

to inscribe three equal circles, each touching two 

sides of the triangle and two other circles. 

Bisect the angles of the triangle, letting the 
bisectors cut the sides of the triangle in i, 2 
and 3. With centers i, 2 and 3 and radius 1-2, 
describe arcs cutting bisectors in 4, 5 and 6, the 
centers of the required circles. A perpendicu- 
lar (Prob. 8) from the center of any circle to 
the side of the triangle will determine the radius 
of the circle, and also the point of tangency. 

Prob. 25. — Within a given circle to inscribe three semi- 
circles, each touching the circumscribing circle, 
and their diameters forming a 
regular triangle. 

Draw two diameters, 1-2 and 3-4 at right an- 
gles to each other, intersecting in 5. Divide 



the circle into twice as many parts as there are 
semicircles to be inscribed, beginning at i. 
Draw diameters 6-7 and 8-9. Connect 2-3, cut- 
ting diameter 8-9 in 10, which locates one point 
of the required triangle. With 5 as center and 
radius 5-10, set off 1 1 and 12, which when con- 
nected form the triangle. Draw lo-ii, 11 -12 
and 12-10, giving points 13, 14 and 15, the cen- 
ters of the required semicircles. 

Prob. 26. — ^Within a given square A B C D to inscribe 

four equal circles, each tangent to two 

others and two sides of a square. 

Draw the diagonals and the diameters mter- 
secting in i and giving points 2, 3, 4 and 5. 
Connect points 2-3, 3-4, 4-5 and 5-2, intersect- 
ing diagonals in 6, 7, 8 and 9, which will be the 
centers of the required circles. 

Prob. 27. — Within a given circle to inscribe any num- 
ber of equal circles which shall be tangent to 
two others and to the circumscribing 
circle. In this problem, five. 

Divide the circumference of the circle into 

twice as many equal parts as there are to be 

circles inscribed. Produce the diameters on 



STRUCTURAL DRAWING. 



either side of 2-7 until they meet a perpendicu- 
lar erected to 2-7 at 2. Bisect angles 12 and 13 
and let bisectors cut diameter 2-7 in 14. With 
I as center and radius 1-14, draw a circle cut- 
ting diameters in 15, 16, 17 and 18, the centers 
of the required circles. 

Ptoh. 28. — To draw a line tangfent to a gfiven circle 
through a given point A. 

Pass a line through center i and point A in- 
definitely. With point A as center and any ra- 
dius, cut this line in points 2 and 3. With 2 
and 3 as centers and any radius, describe arcs 
cutting in 4 and 5. Connect 4 and 5, which 
will be the desired line. 

Prob. 29. — To draw a line tangent to a given point A 
in a circle when the center is not accessible. 

Draw any chord A i. Bisect the chord and 
arc (Probs. i and 2) in 2 and 3. With A as 
center and A 3 as a radius, draw an arc 4-5 ; 
with 3 as center and 3-5 as a radius, draw an arc 
cutting 4-5 in 4. Draw line through A 4 tan- 
gent to the circle. 



Prob. 30. — Draw a circle tangent to a given point C in 

line A B and through the fixed point D 

without the line. 

At point C erect a perpendicular (Prob. 9). 
Connect C D and draw a perpendicular to its 
center (Prob. i) intersecting the first perpendicu- 
lar in I, which is the center of the required circle. 

Prob. 3t. — Draw a circle tangent to a given circle A, 

also to a given line B C at a given point D 

in the line. 

Pass a line through D perpendicular to B C. 

Lay off D i the length of the radius of circle 

A and draw A i. Draw perpendicular to A i 

(Prob. i) intersecting the line i D in 2, which 

is the center of the required circle. 3 and D 

are the points of tangency. 

Prob. 32. — At a given point E in line D B draw two 

arcs of circles tangent at this point and to 

the two lines A B and C D. 

Make B i equal to B E. Make D 2 equal 
to D E. Draw E 3 perpendicular to D B, 1-4 
perpendicular to A B and 2-3 perpendicular to 
C D. Points 3 and 4 are the centers of the 
required arcs. 



STRUCTURAL DRAWING. 



Ftoh. 33.— Having given parallel lines A B and C D, 
to connect by two arcs of circle which shall 
be tangent at points B and C and pass 
through point E, which is any- 
where on line B C. 

At B and C erect perpendiculars. Bisect B 
E and E C, intersecting the perpendiculars in i 
and 2, the centers of the required arcs. 

Prob. 34. — To draw an ellipse by means of a trammel, 
having the axes given. 

The semi-diameters of the ellipse are repre- 
sented by A B and A C. Lay off on the straight 
edge of a piece of paper 1-2 equal to A B, also 
3-2 equal to A C. Keeping point i on the 
short diameter and point 3 on the long, mark 
off as many points at 2 as desired to form the 
curve of the ellipse. 



Prob. 35. — To draw a line tangent to an ellipse at any 
given point, as E, in the curve. 

With point C as center and A i as radius, 

describe an arc cutting diameter A B in F and 

F', which points are called foci. Extend a line 

from F' through E indefinitely. Make E 2 

equal to E F. Bisect the angle F E 2, giving 

the desired tangent. 

Prob. 36. — To draw a line tangent to an ellipse, passing 
through a given point E without it. 

Find the foci as in Prob. 35. With point E 
as center and radius E F, describe an arc. With 
F' as center and A B as radius, describe an arc 
cutting the first arc in points i and 2. Connect 
F' I and F' 2, cutting the ellipse in points 3 
and 4. Draw lines from E through 3 and 4, 
which will be tangent at 3 and 4. 



Plate 4. 



PR0B.28. 




PROB. 29. 



PROB. 51 








PROB. 


33. 




C 


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^A 


i 


\ ^ 






/ 


/' ^- ' „ 



^ 



PROB. 3G. 




CHAPTER III. 

SIMPLE PROJECTION, INTRODUCING THE PRINCIPLES OF WORKING DRAWINGS. 



The working drawings of any object are such 
drawings, accompanied by the proper measure- 
ments, as will tell all the facts concerning that 
object. Such drawings if sent to a mechanic 
would be sufficient to enable him to perform 
the desired piece of work without further ex- 
planation. The number of views required de- 
pends entirely upon the character of the subject 
to be drawn; for instance, in Plate 5, Fig. i, 
two views are sufficient to tell all that concerns 
the cube, whereas for a more compHcated object 
three or even more views may be necessary to 
tell all the facts. 

Plate 5. — To draw the front and top views of 
the cube in three positions. 

Fig. I represents the cube so placed in the 
top view that two edges are parallel to an imag- 
inary horizontal line. In drawing the front 



view we suppose the cube to be resting upon a 
horizontal plane upon one of its faces, and so 
placed as to appear as a square if seen directly 
in front. In the top view we are supposed to 
be looking down upon the cube, its position 
being unchanged. As noted before, the cube 
will be seen as a square in both the front and 
top views, and these should appear directly 
above one another. The space between the two 
views is immaterial, but should be such as to 
appear well on the sheet. The horizontal lines 
should be drawn with a T-square, having its 
head against the left-hand edge of the board, 
whereas the vertical lines should be drawn with 
a triangle resting on the edge of the T-square 
blade. Only three measurements are necessary. 
They should be carefully placed as indicated in 
the drawings, the arrow heads just touching the 



Plate 5. 



FIG. I. 



TOP VIEW 



FIG. a. 




FRONT VIEW 



FRONT VIEW 



FRONT VIEW 



26 



STRUCTURAL DRAWING. 



extension lines from those that they measure, 
not overrunning or falling short. 

Fig. 2 represents the cube turned in the top 
view so that its edges make angles of 45° with 
an imaginary horizontal line. 

Fig. 3 represents the cube turned in a similar 
manner, but at angles of 30° and 60° with a 
horizontal line. In both of these figures the 
top views should be drawn first. From them 
project down and construct the front views di- 
rectly opposite the front view in Fig. i. These 
problems should be lined-in with a medium 
grade pencil, making the result lines, or, in 
other words, the outlines of the cubes, strong 
and black, uniform in thickness throughout the 
drawing, and much resembling an inked line. 
Extension lines should be at right angles to the 
lines to be measured, and measurement lines 
should be left light. Care should be given to 
printing and figuring, as the appearance of the 
sheet depends much upon this feature of the 
work. Figs. 2 and 3 are not necessary as work- 
ing drawings of a cube, but are given as simple 



exercises for the use of the T-square and trian- 
gles, and as a method of representing foreshort- 
ened surfaces and of placing measurements 
upon inclined lines. 

Plate 6,— Fig. i represents the front, top and 
side views of an equilateral triangular prism 
placed so that two of its faces are equally visi- 
ble in the front view. In this drawing the top 
view should first be made, from which the 
front and side views are projected. The stu- 
dent should take notice that the width of the 
side view is equal to the altitude of the trian- 
gles formed by the top view and not to one of 
its sides, as many beginners are apt to suppose. 

Fig. 2. — Draw the front and top views of a 
regular hexagonal prism according to the meas- 
urements given. In this, as in Fig. i, the top 
view should be drawn first and the front view 
projected directly below. Both the triangle in 
Fig. I and the hexagon in Fig. 2 may be con- 
structed by the use of the 30° and 60° triangle, 
or more accurately, by the use of .the compasses 
as given in geometric problems 16 and 18. 



Plate 6. 



FIG. r. 



FIG. 2.. 




TRIANGULAR 

AND 

HEXAGONAL PRISMS 




ITOP VIElwI 




FRONT VIEIW 



SIDL VIEW 



FRONT VIEW 



28 



STRUCTURAL DRAWING. 



Plate 7. — The drawing at the left represents 
the front and top views of a square pyramid. 
Note that the height of the pyramid is given 
on a measurement Hne parallel to the axis and 
not parallel to the slant line of the pyramid. 

The chimney model is represented by front 
and top views and a vertical section ; this section 



is supposed to be cut through line A and the 
front half removed. The surface cut by this ver- 
tical plane is section lined at 45°. Different 
pieces of material adjoining one another are sec- 
tion lined in different directions as shown in 
this problem. 



Plate 7. 




FRONT VIEW 



SQUARE PYRAMID 

AND 

CHIMNEY MODEL 



% 



W^ 



1 





-in 







— |C0 —IN 

X-- 








-- 




- A 


— 








Wa 1 




1 




J. 5" 


VI 


I'lE]' IB T 'g 


16 Jib 1 


1 
1 
1 
1 


1 

1 


TOP VIEW 








■ 1 

1 

J- 
i_. 
















^ 











SECTION 



FRONT VIEW 



3° 



STRUCTURAL DRAWING. 



Plate 8, — The drawing at the left represents 
the front and top views of a paneled prism 
turned at an angle of 30° and 60°. The top 
view should be drawn first ; the main lines of 
the prism and the vertical lines of the panel 
may then be projected down to their respective 
places as indicated by the connecting lines. In 
the drawing at the right we have the front and 
top views, and a vertical section of a hollow 



flanged cylinder. The top view should be drawn 
first, as in nearly all cases when the object is 
based upon the cylinder. As but one piece of 
material is shown in the section, all the section 
lines run in the same direction. In mechanical 
drawing, the front view of objects based upon 
the cylinder are frequently represented half in 
elevation and half in section, instead of making 
a separate drawing of the section, as in this case. 



Plate 8. 




SQUARE PRISM 

AND 

HOLLOW CYLINDER 



I 

i 

i 




TRONT VIEW 



SECTION 



FRONT VIEW 



32 



STRUCTURAL DRAWING. 



Plate 9, — Draw the front, top, right and left 
side views of a cylinder and a cube, as placed in 
the drawing. Locate the top view, from which 
project points down, so placing the objects in 



the front view. The spaces A', B', C, D' and E' 
of the right side view are equal to spaces A, B, 
C, D and E of the top view The vertical heights 
in the side views are equal to those of the front. 



Plate 9. 




COMBINATION or 

CYLINDER A^.0 CUBE 



LEFT SIDE VIEW. 



FRONT VIEW. 



RI&MT SIDE VIEW. 



34 



STRUCTURAL DRAWING. 



Plate 10, — Fig. I represents the front and top 
views of a hexagonal prism. In the front view 
this object shows two of its faces equally and 
is so inclined that its base makes an angle of 
30° with the horizontal plane. First, draw the 
front view, making the short lines at 30° and 
the long lines at 60°, and the distances A and B 
in the front view equivalent to A' and B' in 
the diagi'am Fig. 2 ; this diagram being a reg- 
ular hexagon. In the top view the distances 
C, D and E are equal to C, D' and E' in the 
diagram. Having obtained the position of 
these horizontal lines, project points in the 
front view to corresponding lines in the top 



view, giving points to be connected by straight 
lines. 

Fig. 3. — The top view as shown in this 
figure is the same as in Fig. i , but turned at an 
angle of 45°. The front view of this object in 
the turned position must be quite different in 
appearance from that in Fig. i ; but all its points 
will appear to be at the same height as before it 
was revolved. This being so, we have simply to 
project corresponding points in the top and front 
views until the lines intersect, giving the several 
points, which are connected by straight lines. 
For instance, point F may be traced from one 
view to another, as shown in the drawing. 



Plate 10. 



FIG. I. 



HEXAGONAL PRISM 
FIG. i. 



FIG. 3. 




FRONT VIEW 



FRONT VIEW 



35 



STRUCTURAL DRAWING. 



Plate U. — In this plate we have the hexago- 
nal prism resting across the square prism, their 
projections to be carried out precisely as in the 
plate preceding. To find the projection of 



the hexagonal prism as shown on the left por- 
tion of the plate, proceed as in Plate lo. 
Measurements should be placed only upon 
lines that are not foreshortened. 



Plate I I . 




FRONT VIEW 



FRONT VIEW 



CHAPTER IV. 



STRUCTURAL DETAILS. 



Plates 12, 13 and 14 are given to acquaint 
the student with the exact shapes given to the 
principal members that enter into the steel 
structure. He should make careful drawingis, 
full size, according to the given measurements, 
which are taken directly from the standards 
used by the leading rolling mills of America. 

The slant for the flange in both the I and 
channel betims is drawn to the American Stand- 
ard of one to six, or 1 6f per cent. Fillet A in 
both the I and channel beam is formed by an 



arc whose radius is ^ the thickness of the web 
at its thinnest section. Fillet B is formed by 
an arc whose radius is equal to the thickness of 
the web plus ^ of an inch. 

If the student cannot secure an engineer's 
scale, he may reduce the decimal fractions to the 
nearest sixteenth or thirty-second of an inch. 
With care the scale illustrated below can be 
made on a heavy paper. This will give any 
measurement necessary from 1^0 of an inch to 
six inches. 




o.i2J45£7.ae 



Q. 








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42 



STRUCTURAL DRAWING. 



Plates 15, 16, 17 and 18 are not given as 
exercises in drawing, but as reference plates. 
Thus, Plate 1 5 presents the principal I and chan- 
nel beams in general use. The student will 
notice that only a portion of the I and channel 



beam is shown in each case, just enough to 
give all the measurements necessary to make 
the completed drawing. For instance, the 
drawing in the upper left-hand corner presents 
the measurements for a 3" .1 beam. 



Plate 15. 



Dimensions °^ I-Deams and Channels 




Plate 1 6. 



-li" 



Dimensions or Angles 

ANGLES WITH EQUAL LEGS 



3^' 
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6"x6" L. 

ANGLES wiTM UNEQUAL LEGS 

1^ 




2x2i"L. 



Plate 17. 



DIMENSIONS ofTEES 
Teeis with EIqual Legs 



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Plate I 8. 



Dimensions o'^Z-Bars 






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48 



STRUCTURAL DRAWING. 



Plate 19. — Fig. i presents the conventional 
method of representing the hexagonal nut. 
The student will see by the table of approxi- 
mate proportions that the nut is drawn to fit 
a bolt f" in diameter. Arc A-B is struck 
from center C limiting the arcs struck from D 
and E as shown by the dotted lines. 

Fig. 2 presents the conventional method of 
representing a bolt with a square head and nut. 
The student should note that the slant of the 
threads is equal to one half the space between 



two adjoining threads ; that is, A is equal to 
one half B. 

The drawings on the lower half of the plate 
give the exact shapes of completed rivet heads. 
The distance A is governed by the thickness of 
the plates riveted. In a scale drawing the head 
of the rivet is always drawn as a semicircle ; 
but in copying this the student should use the 
three centers, as indicated, to acquire a better 
appreciation of the true shape of the head. 




9 

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5° 



STRUCTURAL DRAWING. 



Plate 20. — This sheet represents the standard 
drawings, given by the American Bridge Co., 
of the loop rod, eye bar and clevis. Two 
views are given of both the loop rod and eye 
bar, and three of the clevis. 



This plate makes an excellent exercise in 
drawmg especially in the use of the tangents. 
To derive the full benefit of the problem the 
student should make this drawing at least one 
half full size. 



52 



STRUCTURAL DRAWING. 



Plate 21. — This plate gives the working 
drawings of a sleeve nut and turnbuckle, accord- 
ing to the standard proportions given by the 
American Bridge Co. 

The student should first consider the center 



lines, and after they are placed block in the 
main proportions ; the small details will follow 
in order. 

This affords an excellent exercise in drawing, 
especially in the use of the tangents. 



Plate 





SECTION OM A B 



E 



i*-2i^i* 4-,; >^2i- 

I I I* 5 



H tM^ 



if- 



1 r-re tg- 



Sleeve Nut 






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5CALt= I I I 1 I ' I r I -4- 



TURNBUCKLE 

o 

H-T-l 



fj 



3^, 




^- ^ 






54 



STRUCTURAL DRAWING. 



Plate 22, — This plate presents four typical 
anchors that are in general use. In each draw- 
ing the front view and horizontal section are 
shown, that is, the I beam is supposed to be 
cut horizontally just above its connection with 
the anchor, thus showing the details more 



clearly. In Fig. i, A represents the front view 
of the I beam with its connections, B the top 
view or horizontal section. In drawing this 
the student should first consider the front and 
top views of the I beam, after which the anchor 
and its details may be added. 



Plate 22. 



B 



A 
FIG. 1 . 



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J 



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ANCHORS 



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rail 



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16 






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^Iiite^ 



^W^ 




56 



STRUCTURAL DRAWING. 



Plate 23, — Fig. i gives the front, top and 
side views of two I beams connected by a cast 
iron separator. For a better understanding of 
the separator see Fig. 2, and for the details of 



the I beam see Fig. 4. Fig. 3 presents a type 
of separator used in smaller beams than that of 
Fisf. I. The student should make these draw- 
ings large, as nearly full size as possible. 



o 

or 

I 
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to 
Z 
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kJ 

CQ 

I 



fc;:: 




S8 



STRUCTURAL DRAWING. 



Plate 24, — This plate gives the conventional 
signs for rivets as designed by F. C. Osborn, 
C. E. 

Fig. I represents the front and bottom views 
of two angles riveted to a web plate. The 
student will note that the four rivets at the left 
of the dotted line are designated as Shop; this 
means that the riveting is to be done at the 
shop ; those at the right of the dotted line are 



designated as Field; that is, the riveting is to be 
done at the building. The student will also 
notice that the signs indicate whether the rivets 
are to be countersunk or not, and the side on 
which the countersinking is to occur. 

Fig. 2 gives the method of showing whether 
the heads of the rivets are to be flattened or 
not, and how much ; the amount being indicated 
by the diagonal lines. 



Plate 24. 



OsBORN Rivet Signs 



Shop 



Field 



Plain | Countersunk™°Chipped 

FAR SIDE NEAR SIDE BOTH SIDES 1 



COUNTEIRSUNKano CHIPPED 

FAR SIDE NEAR SIDE BOTH SIDES 



Plain 



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" I 



PLATTCNED TO i High 

FAR SIDE NEAR SIDE BOTH SIDES 



FFGl- 
TLATTENED ToihllGH 

FAR SIDE NEAR SIDE BOTH SIDES 



Flattened to f High 

FAR SIDE NEAR SIDE BOTH SIDES 



4 — 4 




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FIGZ.- 



6o STRUCTURAL DRAWING. 



Plate 25.— This plate represents the rivet differs a little from the preceding, being not 
signs used by the American Bridge Co. and quite as complete, 
known as the Pencoyd System. This method 























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62 



STRUCTURAL DRAWING. 



Plate 26, — Fig. i gives the front and top 
views of a single laced column. The student 
will note that this is made up of two channel 
beams held in position by plates of steel, in 
this instance 2" wide by J" thick. 



Fig. 2 represents the drawing of a double 
laced column. In this, as in Fig. i, the lacings 
are drawn at an angle of 45°. 

Fig. 3 gives several standard sizes of lattice 



bars in general use. 



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64 



STRUCTURAL DRAWING. 



Plate 27. — This and the following plate rep- 
resent the framing angles that are in general 
use among the principal construction compa- 
nies. The student will note that in every in- 
stance, the measurement from the center of the 
first row of rivets to the back of the angle is 



two and one half inches, and from the center 
of the first row to that of the second, two 
and one quarter inches. This regularity is de- 
signed to simplify the punchings for the rivets, 
so that the several holes may be punched at one 
operation. 



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68 



STRUCTURAL DRAWING. 



Plate 29, — This plate presents the front, top 
and side views of the framing of a steel floor 
beam into a girder. The isometric drawing in 
the upper right-hand section of the plate is 
given to show the student more clearly the 
relative positions of the different members, the 



positions of the rivets being omitted. The 
size of the rivets in this and all other plates to 
follow are to be f " unless otherwise mentioned. 
The drawing should be made at least one half 
full size, and all measurements placed as indi- 
cated. 



Plate 29. 




^4.35-> 



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y- 






r n: 







10 
- 1 



I50MCTRIC VIEW 




12 9 s J o 

3 C A LE = I I I I I I I I I I I i-l 



70 



STRUCTURAL DRAAVING. 



Plate 30. — This plate represents the front, 
top and sectional views of a plate girder. 

This girder is built up with one central plate, 
known as the web, and reenforced by top and 
bottom plates and angles. The student will 
see that the angles used in the upper and lower 
members are 5" x 6" while the stififeners or 
upright angles are 4" x 4". Both single and 
double riveting is used in this girder. The 
space between the rivets which is technically 
called " pitch," is governed by the character of 
the design and the load to be carried. The 



maximum spacing for a f " rivet is 6" and the min- 
imum 2^". The distance between the center of 
a rivet and the outside edge of any flange 
should not be less than i^". 

The measurement directly to the right of the 
section is read thus : Six 3^" spaces are equal 
to I '-9". This applies to the spacing of rivets 
when several are spaced equally as in this 
drawing. 

This problem should be drawn at least one 
fourth full size. 



Plate 30. 



i d) d) (b d) d) — d) i ]d) cb cb d) — d) d) cb (fa d) d) i k 



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DETAIL OF 
PLATE GIRDER 



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/j2 STRUCTURAL DRAWING. 



Plate 31, — This drawing represents the front, general instructions given in the foregoing 
top and sectional views of a box girder. The plate may apply to this drawing. 



Plate 31. 



[4)_ (}) 4) (|) (^ 4) _(^| i (|) (J) (1) c}^ 4) ^ ^ _^J i ^ 



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DETAIL OF 
BOX GIRDCR 



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?4 



STRUCTURAL DRAWING. 



Plate 32,— This drawing presents the front, 
top and side views of a base together with the 
connection of a "closed column." The base is 
made of cast iron, the top surface being faced 
or planed off at the mill, giving an even bear- 
ing surface for the column. 

The small circle at A represents a hole in the 
casting, about i^" in diameter. These holes are 



arranged so the mason can pour in grout (thin 
mortar), after the ba e is properly set. By this 
method the mason is able to fill any openings 
that may have been left unfilled. 

This type of base is quite generally used ; 
but in practice, special designs and dimensions 
must be considered to meet the requirements 
of the particular problem. 



Plate 32. 




JH _Y_ X - 



Detail 

OF 

Basc for Column 



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76 



STRUCTURAL DRAWING. 



Plate 33. — This drawing gives the front, top 
and side views of a "closed column," built up 
of plates and angles. It is an enlarged detail 
of the preceding plate, taking in the portion of 



the column above the face line. Detail A 
gives the measurements necessary to make the 
drawing of the upright angle, while section B 
gives the measurements for the horizontal anffle. 



en 

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Q- 




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78 



STRUCTURAL DRAWING. 



Plate 34, — This drawing presents an " open 
section column," built up with an I beam and 
two channels. Detail A gives a portion of the 



necessary measurements in making the drawing. 
The student should draw this to a large scale in 
order to get the full benefit of the problem. 







Izillr"^- 



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So 



STRUCTURAL DRAWING. 



Plate 35, — This plate presents a " closed col- 
umn," built up of four Z-bars and three plates. 
Two angles are used at the base to stiffen and 
create a proper connection between the base 



and the column. Fig. i gives an enlarged de- 
tail of a portion of one of the Z-bars. This is 
given to assist the student with the minor 
details. 



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82 



STRUCTURAL DRAWING. 



Plate 36. — This plate gives the front, top and 
side views of the connection between an I-beam 
and a Z-bar column. This is one of the sim- 
plest connections in use, the supporting mem- 
ber being simply an angle iron. The student 
will note that the solid black openings as at A 



indicate "field riveting," that is, the riveting is 
to be done as the building is being erected. 

Fig. I presents an enlarged detail of one of 
the Z-bars while Fig. 2 gives the detail of an 
I-beam. 






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84 



STRUCTURAL DRAWING. 



Plate 37. — This plate presents the front, 
top and side views of a Z-bar column, showing 
the connections with I-beams. The I-beams 
are connected to the column by means of two 
horizontal angles, the lower one being reen- 



forced or supported by means of two vertical 
angles. The student should note that the leg 
of the angle in each case comes directly under 
the web of the I-beam. 



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86 



STRUCTURAL DRAWING. 



Plate 38, — This plate gives tlie front, top and 
side views of a channel column with its various 
I-beam connections. In many respects the 
connections in this are similar to the last plate. 

Just above the I-beam connections a method 



of splicing the column is shown which usually 
occurs every second story. Fig. i gives the 
detail of the channel, Fiof. 2 the detail of the 



12 
I-beam 



I-beam, and Fig. 3 the detail of the 8" 




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88 STRUCTURAL DRAWING. 



Plate 39, — This plate gives a typical form umn is seldom used on account of expense, 
of the Phoenix segmental column. The col- but makes an excellent exercise in drawing. 



90 STRUCTURAL DRAWING. 



Plate 40. — This drawing represents the front, columns with its several connections. This 
top and side views of one of the typical Phoenix plate makes a very good exercise in drawing. 



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92 



STRUCTURAL DRAWING. 



Plate 41. — This drawing gives three views of 
a typical cast-iron column with its connections. 

The student will note that the top of the 
lug or seat, has a slight pitch. This is done to 



prevent the weight from bearing on the outside 
edge of the seat should any deflection of the 
beam take place. 



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; 42, — Tfe -^ms dao)TiS3 tlner -nei^ of a 
irxmmeftiiMfm M A 35 airaiiiagei iccr m d:DEij)le I-l^am 



Taae iKsmiDecsioii lised to j©ia tiie double 
l-feaiHiis wial i the cohEnna ^rres as a ^fssalor 
as iFeU as a cssmaecticMiL 






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96 



STRUCTURAL DRAWING. 



Plate 43. — This drawing gives the front, top 
and side views of a square cast-iron column 
with its several connections. 

The method of joining the beams is shown 
just above the section A-B. These connec- 
tions occur at each floor, differing from steel 
columns, which usually run through two floors. 

The student should note that the I-beams are 



connected to the column by means of angles, 
unlike the last two plates in which cast-iron 
lugs were used. 

The isometric drawing in the upper right- 
hand section of the plate is given to assist the 
student in reading and making the drawing. 
The rivets and bolts are omitted in this part of 
the plate. 



Q. 




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98 



STRUCTURAL DRAWING. 



Plate 44. — The drawing in the upper section 
of the plate gives the conventional method of 
representing a typical beam-plan. The student 
will note that the main girders are represented 
by a single line, as at G ; while the floor beams 
by a line running in the opposite direction. 
The dot-and-dash line indicates the position of 
the tie-rods. 



The drawing occupying the lower portion of 
the plate represents an enlarged detail of one 
of the floor panels, showing the manner in 
which the beams and girders are framed to- 
gether. 

For a more comprehensive presentation, 
study the two following plates. 



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LOF& 



STRUCTURAL DRAWING. 



Plate 45. — Gives a working drawing of terra- may be used witli the beam-plan of the fore- 
cotta floor construction, end method, such as going plate. 



Plate 45. 











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TERRA CdTTA 


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DETAIL OP 
TLOOR CONSTRUCTION 




ISOMETRIC View 
or 
TERRA COTTA BLOCK 



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TERRA tOTTA ARCH 



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f^-l-O — 
PLASTER 



12.* g" 6' J" o 
5CAUE -^ I n liili ii ^ H- 



STRUCTURAL DRAWING. 



Plate 46, — This drawing gives the front, top 
and right side views of the plate and angle col- 
umn used in Plate 44. In making the drawing 
the student will do well to locate the main lines 
of the column and girder in all three views be- 
fore considering the minor details. 

Fig. I gives the detail of the angle used in 



building up the column. Fig. 2 gives the de- 
tail of the 15" I-beam girder. Fig. 3 gives the 
detail of the 9" I-beam. Fig. 4 gives an iso- 
metric view showing the relative positions of 
the several members. Make the drawing to as 
large a scale as possible. 



I04 



STRUCTURAL DRAWING. 



Plate 47, — This plate represents the working 
drawings of column, No. 32, Plate 44, showing 
the connections between the spandrel beams 
and the column. These beams are located at 
the floor level and carry the wall above as well 
as their portion of the floor. 



Figs. I, 2 and 3 represent the front, top and 
side views of the spandrel girder as shown at 
section E. F., Plate 44. 

The student should first lay out the three 
views of the column and the main 15" girder, 
after which proceed to the details. 



Plate 47. 



l-5i'-^'i^^ 



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FIG 3 



FIG 1 






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Plate 4q. 




Column Connection, 

Wall and Floor 
Construction 



CHAPTER V. 



STEEL MILL CONSTRUCTION. 



Plate 50. — This plate gives the elevation and 
two sectional views of a typical mill construc- 
tion. The corrugated iron in the elevation is 
largely omitted to show the student the method 



of framing. 



In drawing this, it will be well to 



make the sections first and project directly from 
these to the elevation. The drawing should be 
made large ; and for a more definite idea of the 
construction the student will do well to con- 
sult the four plates of details that follow. 



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STRUCTURAL DRAWING. 



Plate 5 J. — This plate presents the detail 
drawing of a corner of the building, including 
a part of the foundation. While making this 
the student should consult the previous plate, 
and not merely copy the lines as given. Every 



line should be considered in both drawings. 

The corrugated iron in the top view is shown 
as a single wavy line. It is best to draw the 
sections before the elevation. 



nvHdsv yo yvj. jo :3±3yoNoo 3Nij 




STRUCTURAL DRAWING. 



Plate 52, — This plate gives tlie detail draw- 
ings of an upper corner of the building, taking 
in the cornice. 

The section at the right should be considered 
before drawing the elevation. Draw the main 



outHnes of the frame before any of the minor 
details. Note that the front view of the gutter 
is omitted, leaving the framework to stand out 
clearly. 



ii6 



STRUCTURAL DRAWING. 



Plate 54. — This illustration represents the 
detail of the window and a portion of the foun- 
dation, as shown in Plate 50. This and the 
above mentioned plate should be studied care- 



fully. Draw the two sections first, and then 
project to the front view, completing the draw- 



SMiyos ovn ||xi 




ii8 



STRUCTURAL DRAWING. 



Plate 55. — This plate presents the details of 
the window, as shown in Plate 50. This draw- 
ing takes in the upper portion of the window as 
well as a section through the meeting-rail. 



In making the drawing consider first the sec- 
tions and the main framework, and later the 
minor details. 



Plate 55. 



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CORRUGATED 
STEEL 



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122 



STRUCTURAL DRAWING. 



Plate 57. — This illustration gives the general ing consider the plates that follow, especially in 
outlay of a sixty-foot truss, showing the position locating the smaller details. 



of its several members. 



In making this draw- 



Plate 57. 




Detail or Truss 



60-0 C-C ANCHOR BOLTS 



Diagram or Truss 




60-0 C-C ANCHOR B0LT3 



4^ i 



124 



STRUCTURAL DRAWING. 



Plate 58. — This and the three following plates 
represent details taken at the principal connec- 
tions, as shown in Plate 57. 

In this as in the details mentioned several 



views are given to bring out all the facts con- 
cerning the connections. The student should 
make a careful study of every portion, noting 
the manner in which the members are connected. 



Plate 58. 



I ' >< 



Details of truss 



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SECTION ON A-B 



Plate 59. 



Details of Truss 




f I ff' ^.l 



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SECTION ON C-D 



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SECTION o~A-B 



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Details of Truss 



Plate 60. 



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Plate 6 1 



Details or Truss 





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SECTION ON A-B 



c li 9 6 3 

Scale: i r i i i i i i i T-i— r- 



CHAPTER VI. 



IRON STAIRCASE CONSTRUCTION. 



Plate 62, — This plate gives the front, top and 
side views of an iron staircase. In making a 
drawing of this the student should study the 
three following sheets of details and not merely 



copy the lines given. The exercise can be made 
more helpful by changing the conditions of the 
problem slightly, and using this as a reference 
plate. 



Plate 62. 



Drawing 



6TAIRCA5E 




I 



i 



f 
i 



= 34 



STRUCTURAL DRAWING. 



Plate 63. — This plate presents the detail draw- 
ing of the lower portion of the staircase together 
with the newel-post, as shown in Plate 62. 

The isometric drawing in the upper left-hand 
portion of the sheet is given to assist the student, 



showing how the riser and treads are secured to 
the newel-post and the stringer. The student 
in making this drawing should first locate the 
risers and treads in all three views, then the 
newel-posts, and finally the minor details. 



late 63. 



c 






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I !ii I 




TAP BOLTS 




Detail 



Newel 



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lyfeg^ 



■X- 



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2. 



Ill 



136 



STRUCTURAL DRAWING. 



Plate 64, — This drawing gives the detail of 
staircase taken at the square landing, Plate 62, 
showing the connections of the risers and treads 
with the angle-posts and the stringers. The 
isometric drawings are given to assist in locating 



the various members of the staircase and show- 
ing their connections. 

To make an intelligent drawing this problem 
should be studied in connection with the above 
mentioned plate. 



Plate 64. 





-fc 



Detail 

or 

Angle Post 




ISOMETRIC or POST 
SHOWING 
ARRANGEMENT OF LUGS 




138 STRUCTURAL DRAWING. 



Plate 65, — This plate presents the upper sec- connections between the stringer and the I-beam 
tion of the staircase (Plate 62), showing the girder. 



Plate 65. 



-4 

-4 



Detail or String 



0J5 



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O 3' 6' 9" \Z' 

I . I . I . I I I , coid: 




140 



STRUCTURAL DRAWING. 



Plate 66. — This drawing presents three views 
of an iron staircase which is enclosed on three 
sides by a brick wall. 

The student should first consider the plan, 



after which carefully lay out the outline of the 
treads and risers in both the front and side views. 
The following plates should be carefully studied 
in relation to the minor details. 



142 



STRUCTURAL DRAWING. 



Plate 67, — This plate presents the working 
drawing of the lower section of the staircase, 
including a portion of the newel-post. By the 
isometric drawing one will readily see the con- 
nections of the various parts. The details should 



be drawn as large as possible. The iron dowel 
protruding from the lug on the stringer, as rep- 
resented at A, is arranged to hold the slate tread 
in position. 



Plate 67. 




DETAIL or Stair 



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1 


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1 ^ 

1 1 
' 1 


1 1 

1 1 
1 1 




144 



STRUCTURAL DRAWING. 



Plate 68, — In this drawing we have the front, 
top and side views of an angle-post, showing 
how the risers and treads are connected with the 
stringers and angle-post. In making the draw- 



ing the student should first locate the angle-post 
in the three views, then the risers and treads, 
finally the lug connections. If he follows this 
method little difficulty will be encountered. 



146 



STRUCTURAL DRAWING. 



Plate 69. — This drawing gives the connection 
between the upper portion of the staircase and 
the floor construction. First locate the I-beam, 
then the floor and ceiling lines, after which the 



main lines of the stringer and tread, finally the 
small details. The isometric drawing in the 
upper left-hand section of the plate will greatly 
assist the student. 



Plate 69. 




STAIR Details 



T 




- 1 



FLOORING 




IX. 



Z^' 



:::^<-i ^^:!MS?M[^°'^SS^B M^ J-fi" 



XH STEEL ROD SPACER 



I-^'S-g 2'><5 FLAT BAR IMBED 

f^> :;',i:ri ^p 1^ concrete: 



IKW FLAT BAR^ 






-I 



WIRE NETTING 
STRETCHED ON BARS 



148 



STRUCTURAL DRAWING. 



Plate 70. — This and the following four plates 
present an iron staircase in which winders are 
introduced. The main features in this problem 
are not unlike those of the two foregoing exam- 



ples, and by carefully studying the isometric 
drawings little or no difficulty will be encoun- 
tered. 



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Plate 74. 



ISOMETRIC 

OF- 

5TAIRCA5E Detail 




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LIBRARY OF CONGRESS 



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029 942 178 8 




